arXiv subjects

Q. Schaeverbeke

Publications and source records attributed to Q. Schaeverbeke.

2 recordsLinked to original sources

arXiv2025

Microsecond-lived quantum states in a carbon-based circuit driven by cavity photons

Semiconductor quantum dots are an attractive platform for the realisation of quantum processors. To achieve long-range coupling between them, quantum dots have been integrated into microwave cavities. However, it has been shown that their coherence is then reduced compared to their cavity-free implementations. Here, we manipulate the quantum states of a suspended carbon nanotube double quantum dot with ferromagnetic contacts embedded in a microwave cavity. By performing quantum manipulations via the cavity photons, we demonstrate coherence times of the order of $1.3μs$, two orders of magnitude larger than those measured so far in any carbon quantum circuit and one order of magnitude larger than silicon-based quantum dots in comparable environment. This holds promise for carbon as a host material for spin qubits in circuit quantum electrodynamics.

cond-mat.mes-hall↗

arXiv2021

Photon-Emission Statistics induced by Electron Tunnelling in Plasmonic Nanojunctions

We investigate the statistics of photons emitted by tunneling electrons in a single electronic level plasmonic nanojunction. We compute the waiting-time distribution of successive emitted photons $w(τ)$. When the cavity damping rate $κ$ is larger than the electronic tunneling rate $Γ$, we show that in the photon-antibunching regime, $w(τ)$ indicates that the average delay-time between two successive photon emission events is given by $1/Γ$. This is in contrast with the usually considered second-order correlation function of emitted photons, $g^{(2)}(τ)$, which displays the single time scale $1/κ$. Our analysis shows a relevant example for which $w(τ)$ gives independent information on the photon-emission statistics with respect to $g^{(2)}(τ)$, leading to a physical insight on the problem. We discuss how this information can be extracted from experiments even in presence of a non-perfect photon detection yield.

cond-mat.mes-hall↗